Fuse plug



Afro/mns W. P. BRIGGS FUSE PLUG Filed April 4. 1922 Patented May 15, 1923.

UNITED STATES WILLIAM PENN BRIGGS, 0F NEW BEDFRD, MASSACHUSETTS.

FUSE PLU G.

Application led ApriI 4,

ToaZZ whom t may coa-0cm.'

Be it known that I, IVILLIAM P. Barcos, a citizen of the United StatesI` and resident of New Bedford, in the county of Bristol and State of Massachusetts, have invented anew and Improved Fuse Plug, of which the following is a full, clear, and eXact de-l scription.

This invention relates to fuse plugs, and cut-outs, and has for an object to provide an improved construction wherein only the proper size plug may be used in any given cut-out.

Another object of the invention is to provide a fuse plug using prongs, instead of a threaded sleeve.

A still further object is to provide a construction of fuse plug and socket, .which will not` only require the proper size fuse and plug, but which, by its appearance, will indicate the size of fuse used.

In the accompanyingl drawing Figure 1 is a longitudinal vertical section through a plug and cut-out disclosing one embodiment of the invention, the same being taken on the line 1-1 of Figure 2.

Figure 2 is a top plan view of the cut-outshown in Figure 1, with certain parts broken away.

Figure 3 is a top plan view of the plug as shown in Figure 1. y

Figure A4 is an end vewof the structure shown in Figure 2. 7

Figure 5 isl a sectional view of a cut-out similar to the section shown in Figure 1, but showing a modified form of invention.

Re'ferrin to the accompanying drawings by numera s, 1 indicates a support of any Y klndto which the cut-out 2 is connected by suitable screws 3. The cut-out 2 is -formed from porcelain or other insulating material,

,and is provided with four sets of grooves wlres 5 are connected to the base 9 by any ysuitable means as for instance a clamping screw 11. 4Arranged on the cut-out 2 is a covering plate 12 of insulating material, said platebeing held in position by adhesive or any othepsuitable material. Slots 13 and 14 are provided in the plate v12 so as to tit 1922. Serial No. 549,560.

properly over the posts 6. and at the same time exposes the ends of the respective contacts 8. The ends oi' these contacts are positioned near their respective end walls 15 or" the slots 13 and 14, so that the prongs '1G and 17 will press the ends 7 and thereby provide a good contact, said ends also interlocking to a limited extent with the enlargement on the ends of the'prongs.

lThe prongs 16 and 17 are provided with bent ends 18 and 19-for receiving the respective screws 2O and 21, said screws also passing through the ends of the respective fuses 22. These fuses and the screws 20 and 21 are arranged in separate depressions 23 and 24 in plug 25.

In the drawing, two fuses have been shown, together with a cut-out having sockets for receiving the two sets of prongs, but it will be evident that one set oi" sockets can be provided, if desired, or more than two. Also in constructing the device it is intended to color either the plate 12, or plug 25,-or both, for indicating the size of the fuse necessary, at a glance.

In addition,

the posts 6 are designed to be made larger or smaller, according to the sizeof the fuse. In Figure 2, one size post 6 is shown, while in Figure 5 a diHerent size is shown, indicating that a different size fuse will be used. Usually the post 6 of Figure 5 would indicate a stronger fuse 22, than that used with the post 6 in Figure 2.

It will be noted that by the use of the color scheme mentioned, the strength of this fuse may be seen at a glance, and in order to insure that the proper strength is used, the posts 6 are made lof different width, and consequently the prongs 16 and 17 must` be spaced vapart to tthe various cut-outs. Heretofore -cut-outs were provided with threaded sockets for receiving threaded fuse plugs. All of these plugs andsockets were uniform in size though the fuses used in the plugs might vary widely in strength, and consequently it has often occurred that a very strong fuse was used on a very light socket. As this is more or less dangerous, various eii'orts have been made toform the screw thread to act-only with the proper circuit,/but these eorts have proven more or less unsuccessful by reason of the standard size fuses.

In the present instance the fuse may be readily seen at any time, and also by reason of the distance apart of the prongs vonlythe l proper size fuse may be used in a given cutout. It will be understood of course that the depressions 23 and 24 may be covered with mica or any other governing member to pre- 5 vent the blowing of the fuse :trom starting a fire.

I claim- 1. In a fuse plug of the character described, a cut-out structure comprising a base having a plurality of grooves, and a post arranged in each pair of grooves, said posts 'gextending an appreciable distance above the grooves, a plate mounted on said base provided with slots accommodating said posts, said slots being longer than the posts for providing openings, a contact arranged in each of said openings, and a plug member havinor prongs spaced apart in equal distance to said openings so as to .be inserted into the opening, and into engagement with said contacts and the fuse member connected to said prongs.

2. In a fuse plug of the character described, a cut-out provided with a base havl5 ing a pair of up-standing posts spaced apart, a contact carried by the base oneach side ot' each of said posts, a covering plate connected with said base and provided with slots accom modating said posts, saidslots being longer S0 than the posts so as to provide openings adjacent said contacts.

3Q A fuse plug of the character described comprising a cut-out formed with a base having a plurality of pairs of aligned grooves, i5 the grooves of each pair being spaced apart, said base having a post arranged in the space between the respective grooves, said post eX- tending above the top of the base, a plate secured to said base having a slot for each of said posts, said slots being longer than the posts whereby openings are provided, a contact arranged in each of said grooves prop. vided with an engaging. member projecting into each of said openings, a plug member having a prong for each of said openings adapted to engage their respective engaging members, and a fuse bar connecting said prongs together in pairs, the fuse bars extending across the top of said posts from a point above one of said openings to a point above the other of said openings.

4. In a fuse plug, a cut out structure comprising a base having a plurality of pairs of grooves and a post arranged between each pair of grooves, a plate mounted on said base provided with openings merging into said grooves, a contact extending into each of said openings and carried byI said base with part fitting into said grooves, and a plug having contactprongs spaced apart substantially an equal distance to said openings so as to be inserted into the openings and into engagement with said contacts, and a fuse member connecting said prongs.

5. An electrical socket, comprising a base having a plurality of spaced grooves, and a post arranged between said grooves, a plate mounted on said base rovided with openings merging into .saidj grooves, a Contact member carried by the base and extending into said openings, said contact members being positioned in said grooves to receive the prongs of a plug.

WILLIAM PENN BRIGGS. 

